“In relation to Junead Khan the charge is the same, potentially not for martyrdom purposes.

“The two men had been in communication with IS fighters and had expressed a desire to travel.”

Junead also allegedly planned to attack an American soldier by ‘staging a traffic accident’ at either RAF Mildenhall, RAF Lakenheath or RAF Feltwell, the court heard.

“He intended to run over a serviceman and use a knife to kill the serviceman, and to do so, certainly had in mind the wearing of a suicide vest,” Mr Dawson told the court.

Officers from the UK’s national counter terrorism network arrested the pair at their home addresses on July 14.

They both appeared in court in grey prison tracksuits, with Junead also wearing a black skullcap.

He faces two charges of preparing acts of terrorism, while his uncle faces only one.

They were not asked to enter pleas yesterday, but Mr Dawson said not guilty pleas had been indicated.

Judge Howard Riddle remanded the pair in custody until their preliminary hearing at London’s Old Bailey on August 18.

Deborah Walsh, deputy head of Counter Terrorism at the Crown Prosecution Service, said in a statement: “Following an investigation by the Metropolitan Police Service’s SO15, we have concluded there is sufficient evidence and it is in the public interest to charge Junead Khan and Shazib Khan with the intention of committing acts of terrorism.

“It is alleged that Junead Khan and Shazib Khan had been planning on travelling to Syria to join the proscribed organisation Islamic State in Levant (ISIL).

“It is further alleged that Junead Khan was planning a terrorist attack on US military personnel in the UK and he has been charged with an additional terrorism offence to reflect this.”

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